Dissolve the starch in the water in a saucepan. Add eggs and sugar. Rub the zest of the lemons and add.
Bring to the boil, beating constantly.
Immediately pour the mixture into one large bowl or several small bowls and allow to cool. Squeeze the lemons and add the juice. Whip the cream until stiff and fold it carefully into the mixture.
Tip:
Use part of the whipped cream for garnish and garnish with a leaf of lemon balm or chopped pistachios.